2. Surface treatment: advanced technology of shot blasting, 100% rubbed smooth, almost can do zero defects for the surface.

3. Quality assurance: Eddy current test online

4.Service life: Ultra fine martensitic structure which could improve the fatigue life of spring

5. Applicable Industriesl: Widely used in automobile, elevator, motorcycle, electric switches, high-speed rail, machinery. Meanwhile, we also can according to the customer’s requests to produce many kinds of strength level for spring steel wire.